VNC® Enterprise Edition 4.2 - known bugs and features
The following are known bugs, features and omissions in VNC Enteprise Edition 4.2. You may also wish to check the known bugs, features and omissions in VNC Enterprise Edition 4.1.
| Date | ID | Platform / Program | Description | Workaround | Status |
|---|---|---|---|---|---|
| 1 Sep 2004 | 9 | Windows server | The Control and Alt keys can become "stuck" when the Send Ctrl-Alt-Del command is used remotely. | Press and release each key a couple of times from a new viewer session, to cause the server to reset the keys' states. | Under consideration |
| 1 Sep 2004 | 10 | Windows viewer | When Fullscreen mode is selected via the F8 menu, the Windows taskbar can remain on top of the VNC viewer window. | Use the system menu (accessible via the icon at the top left of the VNC viewer window) to enter Fullscreen mode - the bar will then dissappear after a short delay. or Click on the taskbar, then back on the VNC viewer window - the bar will dissappear. |
Under consideration |
| 19 Apr 2006 | 56 | Windows server and viewer | Sometimes when a file is copied to the clipboard on one end of the VNC connection, it is not available for paste at the other end. | Copy the file to the clipboard again. | Under consideration |
| 26 Apr 2006 | 57 | Windows server | Connection fails with "Connection closed unexpectedly" or "Connection reset by peer", and application event log contains messages of the form "Connections: closed: 192.168.0.1:1047 (state(): ...)". | Enable Terminal Services support on the server computer | Fixed in 4.2.1 |
| 26 Apr 2006 | 58 | Java viewer | Viewer hangs when running in full-color mode on JREs prior to version 5.0/1.5. | Disable the auto-select and full-color options before connecting | Fixed in 4.2.2 |
| 27 Apr 2006 | 59 | Windows viewer | Viewer crashes when performing a copy-through operation, i.e. when copying a file from a server, via a viewer & server on an intermediate system, to another viewer. Affects Windows 95/98/Me & NT4 systems. | Copy the file to the intermediate system, then re-copy from there to the destination. | Fixed in 4.2.1 |
| 27 Apr 2006 | 60 | Windows viewer | Copy-through operations fail, i.e. copying a file from a server, via a viewer & server on an intermediate system, to another viewer does not work. | Copy the file to the intermediate system, then re-copy from there to the destination. | Under consideration |
| 27 Apr 2006 | 61 | Unix server | The vncserver command does not recognise license files stored in the same directory as Xvnc. | Add licenses to the default license file | Fixed in 4.2.2 |
| 12 May 2006 | 62 | VNC servers | A security vulnerability was discovered. | Upgrade to fixed version | Fixed in 4.2.3 |
| 12 May 2006 | 63 | Windows server | VNC Server leaks memory rapidly while in use when running on Windows 2000 systems that do not have Terminal Services installed. | Enable Terminal Services support on the server computer | Fixed in 4.2.5 |
| 27 July 2006 | 64 | Windows server | VNC Server leaks memory rapidly while in use when running on Windows XP/2003 systems that do not have the Terminal Services Service running. | Start the Terminal Services Service on the server computer | Fixed in 4.2.6 |
| 27 July 2006 | 65 | Windows server | VNC Server repeatedly logs the error message "unable to switch desktop" in the Application Event Log when running under Windows NT 4. | No workaround | Fixed in 4.2.6 |
| 27 July 2006 | 66 | Windows server | VNC Server may shutdown without warning if certain kinds of screen capture error occur unexpectedly. | No workaround | Fixed in 4.2.6 |
| 27 July 2006 | 67 | Windows viewer | VNC Viewer can hang when used interactively immediately after a large file transfer has been initiated. | Avoid using VNC Viewer while file transfer is in progress | Fixed in 4.2.6 |
| 27 July 2006 | 68 | Unix server | Brief connections to the server can cause it to enter a live-locked state, due to a bug in the Linux kernel. | No workaround | Fixed in 4.2.6 |
| 27 July 2006 | 69 | Java viewer | VNC Viewer reports the session encryption level incorrectly when using the RA2ne security type. | No workaround | Fixed in 4.2.6 |
| 27 July 2006 | 70 | Java viewer | VNC Viewer reports identity hashes that differ from those reported by native VNC Viewers. | No workaround | Fixed in 4.2.6 |
| 27 July 2006 | 71 | VNC servers | VNC Server may crash when handling large, rapidly-changing XOR'd cursors. | Use static or non-XOR'd cursors | Fixed in 4.2.6 |
| 27 July 2006 | 72 | VNC servers | Session disconnection is not logged when sessions fail in certain rare cases. | No workaround | Fixed in 4.2.6 |
| 6 October 2006 | 73 | Windows Server and Viewer | Files are sometimes transferred as zero length. | Transfer the files again | Fixed in 4.2.7 |
| 6 October 2006 | 74 | All file transfer implementations | Single file transfers taking longer than 5 minutes cause the connection to be dropped. | No workaround | Fixed in 4.2.7 |
| 6 October 2006 | 75 | UNIX server | Inetd wait mode is broken. | No workaround | Fixed in 4.2.7 |
| 6 October 2006 | 76 | Windows viewer | VNC Viewer saves an invalid hostname when saving a .vnc file from the Connection Details dialog. | Wait until the connection is established and then save the .vnc file.
or Open the .vnc file in a text editor and delete the line that begins Host= | Fixed in 4.2.7 |
| 6 October 2006 | 77 | All servers | Connections that have data waiting to be sent are not correctly cleaned up. | No workaround. | Fixed in 4.2.7 |
| 27 October 2006 | 78 | All UNIX binaries | Programs exit with "Aborted" when run against some versions of libstdc++. | No workaround. | Fixed in 4.2.7 |
| 4 January 2007 | 79 | Windows server | VNC Service-Mode Server may exit unexpectedly when logging out or switching users under Windows Vista. | No workaround. | Fixed in 4.2.8 |
| 4 January 2007 | 80 | Windows server | VNC Service-Mode Server configuration cannot be accessed under Windows Vista, even by members of the Administrators group. | Right-click on the "Configure VNC Service" menu item and select "Run as administrator". | Fixed in 4.2.8 |
| 4 January 2007 | 81 | Windows viewer | For languages which use Input Method Editors (IME)s for input, the IME switching key-sequence is handled by VNC Viewer, preventing keyboard input from being correctly passed to the server-side IME. | Use the server-side IME interface to activate the desired IME at the server, without affecting the viewer's IME status. | Fixed in 4.2.8 |
| 14 February 2007 | 82 | Windows viewer | Mouse input can be erratic when using pointer event rate-limiting. | Disable pointer rate-event limiting | Fixed in 4.2.9 |
| 14 February 2007 | 83 | Windows viewer | When viewing a desktop that is larger than the viewer's display area in full-screen mode, VNC Viewer fails to re-position the desktop if the server resizes it smaller. | "bump" the cursor against the top and/or left of the screen to trigger bump-scrolling, which will correct the position. | Fixed in 4.2.9 |
| 14 February 2007 | 84 | Windows server | When accessing a server with two or more keyboard layouts installed, or which is running Windows Vista, it may not be possible to enter text into Command-Prompt windows, due to bugs in Windows' keyboard layout handling. | None | Fixed in 4.2.9 |
| 14 February 2007 | 85 | Windows server | It is not possible to enter the key combination Shift+Space remotely. | None | Fixed in 4.2.9 |
| 14 February 2007 | 86 | Windows server | Connections close unexpectedly with "Desktop in use" error messages logged as the reason for disconnection. | None | Fixed in 4.2.9 |
| 14 February 2007 | 87 | Unix server | VNC Server can crash with a bus error when using domain-keyed licenses on platforms that required aligned memory accesses. | Use a non-domain-keyed license | Fixed in 4.2.9 |
| 19 February 2007 | 88 | Mac server (4.2.9) | The Java viewer cannot be loaded. | Use version 4.2.7. | Fixed in 4.3 |
| 19 February 2007 | 89 | Windows server (Vista) | Ctrl+Alt+Delete does not work. | The problem can be mitigated by configuring your system not to require Ctrl+Alt+Delete in order to log on. To do this, go to Control Panel > User Accounts > Manage User Accounts > Advanced and unselect Require users to press Ctrl+Alt+Delete. | Fixed in 4.3 |
| 18 April 2007 | 90 | Mac server | Changes made in the Service Properties have no effect. | Run the following command in a terminal window (requires administrator privileges): sudo chmod g+w /var/root/.vnc/prefs |
Fixed in 4.3 |
| 10 May 2007 | 91 | Mac server | Adding new license key succeeds but "The trial period has expired" error still occures when connecting. | Run the following command in a terminal window (requires administrator privileges): sudo chmod g+w /etc/vnc/licensekey |
Fixed in 4.3 |
| 26 Jul 2007 | 92 | Windows viewer | Changing the encryption for a new connection does not affect that connection. | Disconnect and reconnect. | Fixed in 4.3 |
If you encounter a bug with VNC Enterprise Edition, please first make sure you are running the latest release. If the bug still exists, please report it via the appropriate support channel.